Top of Tyrol

Iguazu Viewing Platform

Spiral viewing platform located over Iguazu waterfall in Brazil. [link]

Dachstein Skywalk

Located 2.700 m above sea level, this cool skywalk is one of the most popular destinations in Styria, Austria. [link]

Willis Tower Skydeck

Formerly named Sears Tower, Willis Tower is a 108 story skyscraper in Chicago, Illinois. Glass boxes extend out 4.3 feet from the Skydeck on the 103rd floor, providing amazing views of the city. [link]

I’ve been to the Infinity Room at the House on the Rock. I went when I was young and I would never go again. Despite the laws of physics and cantilevering and whatnot I’d expect it to fall over when I’m in it. In fact I’d be hard pressed to get on any of these!